Preserving options with spaces in add_compile_options

Usage
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4

To complete this post, either of the methods below can successfully compile my project.

  1. All flags wrapped with "SHELL:" 
set(fflags "SHELL:-qno-opt-dynamic-align -convert big_endian -assume byterecl -ftz -traceback -assume realloc_lhs -fp-model source -O2 -debug minimal -free")
set(cflags "SHELL:-qno-opt-dynamic-align -fp-model precise -O2 -debug minimal")
add_compile_options("$<$<COMPILE_LANGUAGE:Fortran>:${fflags}>")
add_compile_options("$<$<COMPILE_LANGUAGE:C>:${cflags}>")
  1. Compound flags separated from single-token flags and then wrapped with "SHELL:" 
set(fflags -O2 -ftz -free -traceback -qno-opt-dynamic-align "SHELL:-convert big_endian -assume byterecl -assume realloc_lhs -fp-model source -debug minimal")
set(cflags -O2 -qno-opt-dynamic-align "SHELL:-fp-model precise -debug minimal")
add_compile_options("$<$<COMPILE_LANGUAGE:Fortran>:${fflags}>")
add_compile_options("$<$<COMPILE_LANGUAGE:C>:${cflags}>")